The 5 Detectives consist of the siblings Betty and Pip, Harry and Dizzy, and Freddy. Their group is completed by Buster, their dog.

During their holidays, they are all together solving criminal cases without fear of anything! The time has come for the five friends to reunite once again!

Their holidays pass peacefully until a Siamese cat disappears, and the 5 Detectives are back in action. The search for the thief of the precious cat, wanted by many, is not an easy task.

And just when it seems they are at a dead end, little Betty has a brilliant idea…